package za.ac.cput.garethc.designpatterns.behavioural.observer;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 *
 * @author Gareth
 */
public class WeatherStation implements WeatherSubject
{

    Set<WeatherObserver> weatherObservers;
    int temperature;

    public WeatherStation(int temperature)
    {
        weatherObservers = new HashSet<WeatherObserver>();
        this.temperature = temperature;
    }

    @Override
    public void addObserver(WeatherObserver weatherObserver)
    {
        weatherObservers.add(weatherObserver);
    }

    @Override
    public void removeObserver(WeatherObserver weatherObserver)
    {
        weatherObservers.remove(weatherObserver);
    }

    @Override
    public void doNotify()
    {
        Iterator<WeatherObserver> it = weatherObservers.iterator();
        while (it.hasNext())
        {
            WeatherObserver weatherObserver = it.next();
            weatherObserver.doUpdate(temperature);
        }
    }

    public void setTemperature(int newTemperature)
    {
        System.out.println("\nWeather station setting temperature to " + newTemperature);
        temperature = newTemperature;
        doNotify();
    }

    public int getTemperature() {
        return temperature;
    }
    
}